Refactor Festival Log UI: bookmark metaphor and diary-style layout

[Copilot]

The Festival Log UI had four issues: confusing "favorite/heart" action semantics, status badge overlapping with action button, unclear empty circle indicator, and flat list view not matching diary/log mental model.

Icon Changes

• Bookmark replaces heart - Icons.bookmark/Icons.bookmark_border for "Want to Try" action
• Badge repositioned - Status badge moved from right: 8 to left: 8 to avoid button overlap
• Status indicators - Bookmark icon for "Want to Try", green checkmark for "Tasted"

Festival Log Screen

• Day-based grouping - Tasted drinks grouped by "Today", "Yesterday", weekday names, or date strings
• Inline timestamps - Each tasting shows time (e.g., "2:30 PM")
• Section headers - "Want to Try" section at top, then tasted sections by day with count badges
• Compact cards - Tasted drinks use condensed layout with inline metadata

// Before: flat list with simple divider
SliverList(drinks.map((d) => DrinkCard(d)))

// After: grouped by day with headers
widgets.add(_buildSectionHeader('Want to Try', count));
for (drink in wantToTry) widgets.add(_buildDrinkCard(drink));
for (dayKey in dayKeys) {
  widgets.add(_buildDayHeader(dayKey, count));
  for (drink in tastedByDay[dayKey]) 
    widgets.add(_buildTastedDrinkCard(drink, timestamp));
}

All tests updated to use bookmark icons. 579 tests passing.

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